.bottom {
  height: 40px;
  width: 100vw;
  border-top: 1px solid #666;
  position: fixed;
  bottom: 0;
  display: flex;
}
.bottom .icon {
  flex: 1;
  /* float: left;
  width: 25%; */
  text-align: center;
}
.bottom .icon.active {
  color: red;
}